The official description of the R445 from the
Roads Act 1993 (Classification of Regional Roads) Order 2012 reads: :
R445: Naas, County Kildare — Portlaoise, County Laois — Roscrea, Nenagh, County Tipperary — Limerick — Crathloemoyle, County Clare (Part Old National Routes 7 and 18) Between its junction with
N7 at Maudlings in the county of
Kildare and its junction with
N80 at Stradbally Road in the town of Portlaoise in the county of
Laois via Dublin Road, Poplar Square, Main Street and Limerick Road in the town of Naas: Newhall, Buckleys Cross: Liffey Bridge, Main Street and Edward Street in the town of Droichead Nua; and Ballymany Cross; Dublin Street and Claregate Street in the town of Kildare; Cherryville Cross, Mayfield (including link road to
M7); Mooreabbey and Dublin Street in the town of Monasterevin; and Clogheen in the county of Kildare: Kilinure, Ballybrittas, Cappakeel, New Inn Cross, Greatheath, Ballydavis; Rathbrennan and Dublin Road in the town of Portlaoise in the county of Laois and between its junction with N80 at Abbeyleix Road in the town of Portlaoise and its junction with
N62 at Benamore in the county of North Tipperary via Grattan Street in the town of Portlaoise; Clonboyne, Cloncourse; Portlaoise Road, Main Street, Market Square, Bridge Street and Patrick Street at Mountrath; Holy Cross, Moorefield Cross, Rush Hall, Derrin Cross, Borris-in-Ossory and Ballaghmore Lower in the county of Laois: and Cooleeshill in the county of
Offaly and between its junction with the N62 at Parkmore in the county of North Tipperary and its junction with
N52 at Tullahedy via Inane in the county of North Tipperary Ouris and Busherstown in the county of Offaly: Greenhills in the county of North Tipperary:
Moneygall in the county of Offaly:
Toomevara, Clashnevin,
Lisbunny: Dublin Road, Thomas MacDonagh Street, Pearse Street, Kickham Street, Ashe Road and Clare Street in the town of
Nenagh: and Springfort Cross in the county of North Tipperary and between its junction with N52 at Lissenhall in the county of North Tipperary and its junction with the
N18 at Cratloemoyle in the county of
Clare via Ballinteenoe, Kilmastulla, Gortybrigane and Birdhill in the county of North Tipperary: Dalys Cross, Mountshannon, Annacotty and Groody Bridge in the county of
Limerick: Parkway Roundabout, Dublin Road, Clare Street, Lock Quay, Abbey River Bridge, Northern Relief Road, Castle Street,
Thomond Bridge, High Road, Sexton Street North, Northern Ring Road, Ennis Road, Caherdavin Cross and Ennis Road in the city of Limerick: Lansdowne Bridge at the boundary between the city of Limerick and the County of Clare: and Meelick in the county of Clare. == Dublin to southwest of Newbridge ==